Apparatus for the wet treatment of dust-laden gases



3 Sheets-Sheet l /YTTORNEYS J. WIEMER APPARATUS Foa THE WET TREATMENT oF DUST-LADEN GASES Oct. 22, i968 Fild Aug. 15, 1966 vjEHN L/EMER lill',

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3,406,499 AAPPARATUS Fon THE WET TREATMENT 0F DUST-LADEN GASES J. WIEMER 5 Sheets-Sheet 2 Filed Aug.

Oct. 22, 1968 J. WIEMER 3,406,499

APPARATUS FOR THE wET TREATMENT oF DUST-LADEN GASES Filed Aug. l5, 1966 5 Sheets-Sheet 5 Fig. 3

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United States ABSTRACT F THE DISCLOSURE Apparatus for wet treatment of dust-laden gases including a vessel having therein nozzles for spraying a liquid into said gases and a fiow regulating adjustable annular venturi-like slot through which gases are directed substantially at right angles to the axis of the vessel after the wet treatment.

This invention relates to apparatus for the wet treatment of dust-laden gases, and is concerned with an improvement in or modification of the apparatus described and claimed in U.S. Patent 3,343,341, hereinafter referred to as the parent patent application.

The patent describes and claims apparatus for the Wet treatment of dust-laden gases, wherein the apparatus comprises a cylindrical or polygonal chamber fitted With sets of nozzles along the wall or walls thereof for spraying liquid into the gases flowing therethrough and leaving at its upper end an outlet channel extending outwardly from the axis of the cylindrical or polygonal chamber and wherein the cross-section of the outlet channel diverges in the intended direction of fiow of the gases. In this apparatus the outlet channel is defined by an annular part extending around the upper end of the chamber and by a circular or polygonal plate or body which is situated above or below it, and which has a lower face which is substantially frusto-conical in axial section. The plate or body can be raised or lowered to vary the crosssection of the outlet channel. Additional nozzles disposed on or below the plate effect an improved and more uniform moistening of the gas to be cleaned.

The outlet of this wet processing apparatus has the same effect as a definite number of venturi tubes let into the circumference of the outlet pipe, with a throat crosssection which can be adjusted at any particular time in relation to the quantity of gas which is to be passed through.

This regulation of the orifice cross-section of the slitlike outlet which widens out in the manner of a diffuser is carried out by the raising and lowering of the plate or body which forms one side of the diffuser-like outlet. It is also possible to construct the plate or body so that it only constitutes a portion of this one side, this being the inner portion, whereby the outer portion thereof is disposed so as to be fixed. Even though it has been found in practice that the additional washing and cooling effect of such an apparatus considerably increases the efficiency of the installation as a whole, this advantage is nevertheless associated with an expenditure on material and extra power requirements owing to the continuous raising and lowering of the profiled plate in relation to the operating conditions.

The present invention provides a simplification of the apparatus described in the patent which eliminates or minimises the disadvantages referred to and further improves the efficiency by additional sprinkling, as well as' incidentally economising in materials and power.

According to the present invention there is provided apparatus for the wet treatment of dust-laden gases, wherein the apparatus comprises a cylindrical or polygonal chamber fitted with sets of nozzles along the wall or walls thereof for spraying liquid into the gases which can enter at one end of the chamber and flow therethrough, an outlet channel at the other end of the chamber extending outwardly from the axis of the chamber and having a cross-section which diverges in the intended direction of flow of the gases, and a round or polygonal pan disposed axially of the apparatus and adjacent said outlet channel and arranged so as to be movable thereby to vary the inlet cross-section to the diverging outlet channel.

Preferably, the pan is used as a supplementary sprinkling device, the top portion of the wall of the diffuserlike outlet being utilized as the bottom of a liquid overflow device, the overflow aperture of which is constructed centrally as a gas conducting piece.

In order to enable the invention to be more readily understood, reference will now be made to the accompanying drawings, which illustrate diagrammatically and by way of example some embodiments thereof, and in which:

FIGURE 1 is a vertical section through a vertical apparatus for wet-treating dust-laden gases,

FIGURE 2 is a vertical section through a horizontal form of the apparatus `shown in FIGURE 1, and

FIGURE 3 is a section along the line of IIIe-III of FIGURE 2.

In the apparatus shown in FIGURE l, the gas to be treated enters the apparatus for wet treatment through an inlet connecting piece 1 and passes into a cylindrical vessel comprising an upper wet-treatment c-hamber 2, and a lower spherical portion 3 forming a sump into which a discharge pipe for the clean gas projects. The chamber 2 is provided with nozzles 5 over its periphery, which nozzles are supplied optionally with fresh or circulation water via a pipeline 6. An additional centrally disposed nozzle 7 is connected by a pipeline 8 to the same watersupply system. The nozzles may be either hollow spray cone or solid stream cone nozzles. The wet-treatment chamber 2 with the nozzles is divided off from the sump 3 by means of a partition 9 forming an upper wall of a diffuser-like or venturi-like outlet 10 which extends outwardly from the axis ofthe vessel and from the direction of flow of the gas in the vessel. The wall 9 of the outlet 10 may be provided with wear plates 9 and is rigidly connected with the housing of the vessel, simultaneously forming the base for a flange forming an aperture 11 of which has sloping side walls 12 and is constructed as a vertically disposed gas conducting passage. The gas leaving the wet-treatment chamber 2 flows through this gas conducting passage and then, almost at right angles, through the inlet gap 13 of the diffuser-like outlet 10, the lower wall 14 of which, can also be covered by wear plates 14', is supported on a tube 16 running axially of the vessel, by means of brackets 15. Passing through this tube 16 is a rod 17 on the upper end of which a round pan 18 is fixed so as to be capable of being raised and lowered, during which raising and lowering operations its edges 19 alter the width of the inlet gap 13 of the outlet 10. The pan is dished so that it fills up with the water sprayed through the nozzles 5 and 7 until it overflows. The overflow water is carried along by t-he gas into the outlet 10 whence it flows into the sump 3 so that, in the outlet 10, the gas is subjected to an additional cleansing and cooling. In order to produce an extra swirling motion assisting the precipitation of drops and dust, vanes 20 can be disposed at the end of the outlet. To obviate wear at the rims 19 of the pan 18 and the Side walls 12 of the gas conducting passage, easily removable wear rings 19' and 12 respectively can be fitted. The pan 18 can be moved by means of a raising and lowering device 21. The water collecting in the chamber 2 can be led by way of a pipe 22 to a discharge pipe 23 of the sump 31. An overow arrangement 24 may also be provided for the water which accumulates in the sump 3. The whole apparatus rests on the supports 25 to which may be connected staging and `access boards 26.

The constrcction shown in FIGURES 2 and 3 has the essential difference from that in FIGURE l that, in consequence of the horizontal disposition of the apparatus, the sumps are now constructed along what was the side of the Vessel of FIGURE 1.

The references are essentially the same in all the figures; different parts having ya similar significance are marked with the same references as those in FIGURE 1 in FIGURES 2 and 3 but in the latter they are distinguished by an asterisk.

Thus 3* indicates a collecting tank for the water which accumulates through openings 27 from the lower part of the vessel behind the outlet 10.

From this collecting tank 3* the water passes via a discharge pipe 23* to a water'seal 28 to which the water coming along a piping system 22* from the chamber 2 also ows. The dirty water passes from the water Seal 28 into an outlet channel 29 by means of an overflow device 2412 The gas conducting passage, behind the nozzle areas looking in the gas direction, is marked 11* and its walls 121. In FIGURE 2 this arrangement is not employed as an overflow device but as a conical nozzle shield, or rather as a containing device for the water leaving the nozzle 7.

The wall 14 of the diffuser-like outlet 10 can be carried by supports distributed around the periphery of the vessel 2.

A supporting framework 26* carries the drive means 21 for the pan 18.

From FIGURE 3 it is possible to see how the nozzles 5 are distributed in the individual nozzle areas, the nozzles being connected through valves 30 with a circular pipeline 6.

What I claim is:

1. An apparatus for the Wet cleaning of dust from gas comprising -a housing having a side wall, a top, a bottom, and a partiti-on between the top and the :bottom for forming a gas inlet chamber and a gas outlet chamber on opposite sides of said partition, liquid spray nozzle means mounted on the side wall of the gas inlet chamber for spraying cleaning liquid into said housing, gas inlet means in said gas inlet chamber, gas outlet means in said gas Outlet chamber, a gas passageway in said partition, plate means mounted in said gas outlet chamber and forming with said partition an annular diverging slot between said plate means and partition directed toward said side wall which constitutes a venturi-like structure directed substantially at a right angle to the longitudinal axis through said gas passageway, and dished pan means of substantially the same size as said gas passageway in said gas outlet chamber movably mounted for being lifted and lowered for changing the effective opening from said gas passageway into said slot.

2. An apparatus as in claim 1, further comprising flange means in said gas inlet chamber and surrounding said gas passageway, said flange means being sloped toward said gas passageway, and liquid spray nozzle means mounted within said flange means for spraying gas deflected by said flange means and passing through said passageway.

3. An apparatus as in claim 2, further comprising a wear resisting liner ring in said dished pan means.

References Cited UNITED STATES PATENTS 144,884 Il/1873 Bishop -435 2,937,013 5/1960 Fisher 55-257 3,113,168 l2/1963 Kinney 261-117 3,199,267 8/1965 Hausberg 55-257 FOREIGN PATENTS 1,024,208 3/ 1966 Great Britain.

HARRY B. THORNTON, Primary Examiner. B. NOZICK, Assistant Examiner. 

